| Summary: | 1970-03-30 Analyzing the VLF hiss (or auroral hiss) record at Syowa Station (geomagnetic latitude -69.7°) , Antarctica, which induced the observation on polarization, incident angle and intensity, we have found the evidence that VLF hiss is right-handed, and elliptically polarized, wave (whistler mode wave) , and its incident angle into free space below the ionosphere is small. We have also found that the upper frequency of VLF hiss which appear in advance of the break-up of over-head aurora reaches more than 100KHz and that the maximum energy of the spectrum is received at a frequency near to 10 KHz. Further it is suggested that VLF hiss in the auroral zone is generated by Cerenkov radiation process in the low altitude dark magnetosphere, and that it does not propagate to the middle and low latitudes. departmental bulletin paper
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